Cisco Certified Network Associate (CCNA) Practice Exam

What command reveals all known networks in EIGRP for IPv6?

1. show ipv6 eigrp topology

2. show ipv6 eigrp interfaces

3. show ipv6 protocols

4. show ipv6 eigrp neighbors

The correct answer is: show ipv6 eigrp topology

The command that reveals all known networks in EIGRP for IPv6 is "show ipv6 eigrp topology." This command displays the EIGRP topology table, which contains all the routes learned by EIGRP and their associated metrics. Understanding the EIGRP topology is essential for network engineers because it provides insight into the paths that EIGRP would potentially use for routing packets, as well as the status of those routes. EIGRP (Enhanced Interior Gateway Routing Protocol) maintains a topology table that reflects various routes, their associated costs, and the next hops. This information helps in making routing decisions and optimizing network performance. The other commands listed do serve different functions. For example, "show ipv6 eigrp interfaces" provides information about the interfaces that are enabled for EIGRP, while "show ipv6 protocols" gives a summary of the routing protocols operating on the router. "show ipv6 eigrp neighbors" is used to display information about neighboring routers participating in EIGRP. While all of these commands are useful for network troubleshooting and management, they do not specifically list the known networks in EIGRP like the topology command does.